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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e04f1919035ffc0faeef260fb749fdbac2a89245844dc38befd15fef89113ef1' 
  AND token = 'auqsyIZV/2xYF4ARd4OA1xmzywE/2W0tVqR3sdZZGIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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