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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5d2578e9ed862fc0684e8c5a78b76860c4fdee1b97a882dc1e80aa5a9fbacab' 
  AND token = 'BWpH7GOu4Nz7i5C+SuU36j8B04Kv7AkDn8cprsplJuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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