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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbfd8bcea44c20fc0d655d7efa794dc17246ae48be4d66c54f82a8e3ad7a5e32' 
  AND token = '98iHDXaTcwIGigznr8TQz6nc3PBjqB5kQ5hxc0RjYGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00132

JSON explain

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