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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd583c8340a6ec2b59a13fe5f673cb36bee7bd96cd7f5da5e15ecad6be3de6589' 
  AND token = 'XHmKmOFTZM1FI2rwXI8FLWZAPzn8egiJEsWkruds0TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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