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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdf3a76014f27096e3fbd712ea349f78a82ae145b45228817e6d84c9599d5584' 
  AND token = 'vvLe1RlSVDsmBmDxT2T5X9Bd4WRZm/SfMDKapErQ3oY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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