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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f38ce3f833f86e456fa2e1b2ab0273f95bf88e33bdab1424a8a6c26ba988c5b' 
  AND token = 'UEjuIvuo6PolMo2o5j0WK6M4gsyV7sNCd7B3QD++UbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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