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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00b170f90569802a9ddb7c7065a6388d2a322821cc4abfb3ea6c4488ce34d4d9' 
  AND token = 'Ikf38yPcaj6mnYdBPdBaKMjQxgbQdKTp6PLhtFnVwow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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