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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5510e01239b0bf00187f947984451d46544f41ee8ddb03b5b6e0527074de338' 
  AND token = 'Xlbnocu2X9nb2t4HnB1c70jFjjVDgO5A4hvNtKmVJ1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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