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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '084e65b80d43ad3960cef9cbecd2a82b36b97341bde6595dc138c70aae337a29' 
  AND token = 'hTOHnKThbLwE7PYeBwGtyDJJEZja7P0HJZzG5eSAyBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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