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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ac55b3b25ebf5f0406fd0350dea912cc83b22e799847392d68c69bcd6e5016' 
  AND token = 'QBHvcWCs/WpvUIk0RwvQhQUZxZkuXx7UhiZ8kc/Aog0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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