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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be56ed2fbfb5989463f93372cd2c5a85a4311c40d9d212f44aab8845d46c8669' 
  AND token = 'tUDLYu17Tv59klqFtT9sB6McITSRvqFj5xxTiHN3uYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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