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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acccbc63ed2ff4fe576817baa1b64a8662504c25bb2ed0bd0f02dfc6c23f8504' 
  AND token = 'vI9004VRa1bt7fKWM3hZggLCnnRJB0FLx6f86XExaAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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