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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83de062b0a0915bbc7403708325edc1b152c3675a222afb55bb3107e5055e7f0' 
  AND token = 'Sh9uC0D1oZrcSkI8ZT9sS/4XjlBMEPMyLvvljfH7anU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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