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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47a6dd7552d94dce59f7191d2a07dfc4f6651f79b138c86ddca5bc62c6950cd3' 
  AND token = 'v+rBVPdzkuAq8d0L9Yi/9KAk72okxesypRsFKt08CSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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