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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f5c3aa5ba8a6689b2dd608d43506eb4b6db886b92ac382a04721cfb97923db9' 
  AND token = 'kYaNLDMOoCJw7NZQtbGQidbD0OyO7iAUq1/nJur9Zv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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