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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61ee706c7bb65ac10c10d153ab95dc937a4e2e39519a95496256d4711cef00d6' 
  AND token = '99ZMWiTsij7gJ/TxmcMkjRtm6kp3JArFgH/R+Qlb+8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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