SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ad7e34e0f6b8384ecc2a77257293eb3d804cf31e36e34909fd882650ed1a607' 
  AND token = '8eA/4cHtHauK/B0nYCnRbzJDd/mfjoGkVVHpgUEJVLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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