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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '634b3fb7963231358d3553b2206d33e74a078c5e945520f5de82e139e54b1553' 
  AND token = 'meDxpjsQGduiQpIWI4B0BMsCbS2dqG0okIfqODfKR9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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