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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9103561d5cf6b41839619602ca787cf0e710718af7abb8e5d2f282b59540f98' 
  AND token = '6/CWxiyTUywC6o7WzPk3Jf53plyENrXECdgAtMk77c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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