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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dce7edcd769a9623ed3bc1097f613d86f3705f17972953a012636b8ba983f1d7' 
  AND token = 'eHEaH8mNG9pfaV0lc77EfRRBlxDe1l80it8GpOFyHpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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