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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ae4fa464b92e5a6fddc11fffa3fb6bce9d4909e84ac5b38101bb5984606b1fa' 
  AND token = 'KQJS57nisz2yWi9zciwgD60Uw26mqrpSu1xg1200xKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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