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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d0b1f74787e5690b8fcbe9de2f3f0f874dcb568fd03cb4897d65599598d62f0' 
  AND token = 'NRfa4sDgK6F2V7wZBE5Rrc4o28kUyuCUJftAB3pjElo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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