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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50ec75c4bd7718ea44dc543e602a906541cc4bf0b30e83c246a089120c0d9795' 
  AND token = '9K5XLgBQK9Tex7QtxH6W6bESC/ami1qRZm/mEOIgoII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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