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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b898a4877cc7ace3cbcd499766a329987e026a8f8bec15af8b3b7e13001cd692' 
  AND token = 'KoBcyHLi2nLt815JmkHZQ2wavsSyQwxJsBA+zJCxltQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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