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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a3fd9d9ac908f2b8867f7c307e01c3a88cc5a2f4b14b3e5d2dcb6009fb79b99' 
  AND token = 'zpVstiM0PHK6eHmbisgLBo/f2GbCn0KYkcuXg3LUcnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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