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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04bd639af01ed95cce1cc9ce5a249081ca2a011b47aad45d146ce4f9401d5a8e' 
  AND token = 'q+336IDFdfcoH/U4UfD1e/b3JjZcFUxmg45O4caMymQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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