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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aef96645e6472d4695dbb737a283fd18fdb01c94e6557620d10b675dced23f4b' 
  AND token = 'ShB8kfGBXGIrMbWlQ09+L8x6WxBso2GFM2UQZXAHTvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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