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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b0edc0470c20662ca634892d19e2163de1aaea319beb50df751249a7986273b' 
  AND token = 'oi1IRO0NqiY3ky2zChfffb9jaj5x0cAwTvEZZrLTwJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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