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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10bbc7a137250cd1214cf1df9ada744746ef50b98b4183dac161f5c902ed11ea' 
  AND token = 'jcw60lyNCQgYBAeJCoA6MMXk7oh2zuJv/6U7dF8ziTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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