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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7cb2eee17652d488ac62f7b793d677baa5005c66e3b97e75fab26db7309f2ab' 
  AND token = 'ow8XfGAZ88IkUCM53rKhtH26mBnorpWY8sc96nTGtJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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