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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8012397bb4bb7a0d207b9a5343977c58be62cef1a038ad4f699035f9bb9815eb' 
  AND token = 'CNSxSrx5iHyPtAGbii6u/QwPk/tNdA1ph/2Ip/fYBRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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