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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5dedb81876b478c4dc593f997d98d8e37a0651f5e2dba52ffb50c56ac642ac2' 
  AND token = 'oDYGTKIuwSz4bdhnjO4OCRIzWCWoviN8Rs3NxFqewEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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