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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f135cf29cff11d90e126d19d19e810ddcaee48a71bc9085ec5c2d181474ee29c' 
  AND token = 'hOrw+3yCiQIUvIbjJ7VbDWQJ2XQxEyH/+H8Rulfy/Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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