SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b534c321e0f013e56a0c68881e42c6875dedd31292d17a159aeaef0012b43ca8' 
  AND token = 'Ws9OgivXh/fm+LH4nnZs/L0Gqps9tyblf+pMQCZwd0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00136

JSON explain

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