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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd137c6a7cc212ec1ca17cfe22b68d6abed9c44f01f347856e55e4a1eb300d7ae' 
  AND token = 'iSQMEsyO7Lz1NcgE+0uQfEvet5LXeyegpz8Ks0R3orI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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