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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea44ed84f1beb9124b2f590cf4c17b4c959e0b8caefb4786383a6e5adda5a5b1' 
  AND token = 'inCcLTv4/wPnRMGjtv3lKFiKvf2zzT7diPo7gBSl8KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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