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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dae996fedd6f1e02516773a8a07d908755c71e4f9a4ad0c2327830fed9cf1870' 
  AND token = 'f2oBTwjwUfMYWRkGDJ/qBOnEQt3gP4cD+qCOxlpG070=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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