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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7417cef35d4b7589e3c8523632c251593df7a6b0b43536263baf905f74393d94' 
  AND token = 'JrYcT78O9Ssj5ykMvX6vdLepHS3ruYBbwoK/tiCHies=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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