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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ccd3dada4b17c4bcbbf49f13fc09280945de35cdcbec9484e068bd8d5acceef' 
  AND token = 'Lf5bDRHhJYxYn9YUUQe7hH6RgvwFDxwzOmAroJNZxGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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