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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19be3c818bc443e9ef582e7857f364373711d361c9b14c67fe2137f4142095ca' 
  AND token = 'cBZYxlRk1BmNJaHm+blgfxERyRERQRRS9hj0KeMP+eU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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