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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb530e360eb462b210e466d1c0fc577cd6407fe9680f0f584f58ea19328625ae' 
  AND token = 'LsCx/2o+/w9B4V5+vr9TcI3gHVRD+zYXr/87195wM/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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