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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5b13a591d6fc44c31b4be986b725bc2eaaaf74ad444a9db203d1d952a1aac26' 
  AND token = '2WyW95PGDUjci7HmE97pliGT3IlMH7jDZVQ1mQiOkt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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