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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d50abdd4e1e41666abf40d56950d235759ed2f62dc4debedf7a56e9812f2752' 
  AND token = 'kR4RBTNT2ZKoWNsz9NKWzSdPJaC9YSXqIE+H4IU7/sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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