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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '784422fa5600783d46d57b1267d7b546cd774e76535a7ab31995208b3ce4e89e' 
  AND token = 'qR2pdxg8VzXSDvpiK3A6Hv4UT4YofRnTLoEW+tKCK3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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