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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ab40cdea39efc362c998778d1866ff8de076e847f462e73023c92d868b9f7f4' 
  AND token = '2qZfAVfkoYxr8dFUQ0OxqVg/fiOhIn2Rfi+a/WsKE0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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