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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c9c00817d35ac15d2a33ce2c99b0ba454585cdc42279573c93b0441435a9ed' 
  AND token = 'W7lfdgYrbaesBhpAKqD9I0Da8qwm/rN5xyrglyZTNeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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