SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05aa6d9bf789554278f5368188b9e03448f28b8b713c7158dcfd9998572852c5' 
  AND token = 'yldc+wF3hjID1Xm8O+MZOBLklmRGi+AA+HriPpXoJlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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