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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cba4c76ea4b8a9a6f39f7ce119c836acd9ef4f304ae640da9c2412fd0e2d9e9' 
  AND token = 'tdxZaDt+ZGHyQZHSQ7jTjNGyBg5G67HT8XGAa2oT/iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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