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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68435dc15d2176bff95390c696d05b31ec5c49dc62021f4be90722643401a55e' 
  AND token = 'v1R159CR1o/rzqJHaMWvIVISUpWE7nX/Li1lHCdcm9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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