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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da8638a03698cb351abd38aed0bfb738e650e3e5731e12d18f3e2b87314e027c' 
  AND token = 'fKKarhqW1aTd5YNHXFrBWBC4XWsK9satAxGK8u8QQzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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