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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84f2c1433f2157e316a8db711c3e1257b0af61a929d8f3177549e68b9b3ab1a9' 
  AND token = 'WHVgj5lATHxjb8w87vgFz92U2bOtU93b8YNkM95Zy84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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