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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87b17e89e21eee6d49bb7c0cbdf79b1b75d8cac09d3d39de038c7efe74cac7f3' 
  AND token = '3NqL5LzZ/PElX0BkPS+FATTkgh7VJ79ZXkbsIawtBEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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