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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd9982f731bf194e4718b623eb16d687d0caa16ad625d67b0087db5b8b534326' 
  AND token = '8GhExteVBzFo/BLIuYLOQu+69EsL6QG/EpQNC336ing=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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