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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '522d1b2a64d4634df666c6b1d02efb238e5a103aea013e9735578f9528887a71' 
  AND token = 'VAB028aq2UpEYHfi0Q1QQhuOC6EviWE0XzVf2HJJxR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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