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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3f68b02d11f080a151cdb504cb948d2375e9943d003389192d286ca23249a5e' 
  AND token = 'cmuJMZTcx8vwQNVU7VUQtEJ6OK5/+ZQxx3sLWRHlaVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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