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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddcea60c2dfbfe1378b343a93f459f7fcc2dcab0c7169167ad052a115bb7f75d' 
  AND token = 'SjcPlp1j4mJry9TW8+Wu9c+jX1rfRbiL/xqL2pBbR9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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