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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3763172a90710987f2d162dee9289c4e6f6baa4fa8be98ee50732f92e2c5ba91' 
  AND token = 'ejwh2vth0CQ0v7TOZq215YWX68sb9zeQ47USdkePr1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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