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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56d7b59d469f71bcc83decf4bf72d7d9c3c21c646b1e8b5c76115c86714ce8c9' 
  AND token = 'DZUrvEbvYnWcA12dAMuq0wP76mq/FCzmP2JPONOC3mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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