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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5fd7f9153b4c30cec4fe34f186d5b567e1802ec3a9f0dca7854d42122fdf6af' 
  AND token = 'aPQgVa5aDOtt/qe3jqoQj/0JirWXNz6ZO7+WpBIAWNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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