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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b433695d617c2b6714c3a15dff7bb748276a1a9e57102b36c6373c420a6fa66' 
  AND token = 'c+kCxdeg87Fb+2TkkJ1sbDoU/M9lkS+h7nFEV2o74mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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