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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4fd5b9a619f15d32f942f17acacf7adbf25ae8698b56dd3f10af7cff708623c' 
  AND token = 'ads1tHtfDk5Xob/0NK3BfCBwPV1I6zbq4ymsTPP5EPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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