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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '195ff38763bc29a666882c6754d1b63a49d553d76c88f23da719a6780021f4e5' 
  AND token = '0rHGl8f2s24Hr1JmkV7tLGp9p1AJhPRicueqkcAr6zM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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