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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c472b1c134e70c480076384f89232580123ef57a6d2163281d7e06993237b6f' 
  AND token = 'MMuaBc9k2WYuwn98ML7ou3ZUM5ZAT7RVPQEN3F1gkvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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