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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23a68dcd9c4dc40f88bf4dfae7049edb550bb70f8e75ca1ac984d2d57f5f6671' 
  AND token = 'xa3Yamk08VtHhkzxK6yvDQOyI8wfDqzIhOeK/ORcvpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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