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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2695efe71bef53b7ebd7579f5d4dd9ed483f2d18c19e647879eda50f67eb469e' 
  AND token = 'l0yYHn/w8IUS+haRAyRC1Z1zX/FCItJMeq1LBt+duOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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