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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc1254bb44af76db6a6f3c1562f4a2a400f8fc96db1023c6d587dc765a064640' 
  AND token = '9zOAiMo+fO7P357o11eGrP0aCbBdpXBROoLox5UX96g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}