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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ea6fa3e4cdb02d4218e32eaebb5ed226c61b8a0e9f8adb0516b4000a34a6e9d' 
  AND token = 'OIdXx1Hzu63ndtqF+Zbm9ept7SsM59h+fg40F0Cyj1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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