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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1692fd731c34592ccb4b757ebbd45862014edeeb0d70686d23223d2574ba91b' 
  AND token = '1PuITrmqqMyH0H1eWwqn2rqQSio3Na8ECBC6JEeVzbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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