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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd049a1277c078da72eea040032b41417ad9d6f6eae291510b5b42cea4df68fc' 
  AND token = 'iJBF1ojc4WNvaQKJsguFVxJKqz3cFLHA3VHtI/7/W04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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