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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '262a20c886c0e944e098b8cbf1b36ebf1a8b08577effa00413e812fec5931fda' 
  AND token = 'aLr4nwBmqr8/KOxvUbFQ36qMDYxB/7nn68FXgnbD8Hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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