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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f55fec0d74a5c7959905a37170ca112ae48b25823f19d71990f7679115568b7' 
  AND token = 'GCXq8os4zHp4Dc1/V4mszzccZg8aCG9JhX6Zdob5sH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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