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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '092aa18d7a790e3d492ffa67f1c6e280884ad77398aa72833b8559d5f0daf7a1' 
  AND token = 'X/wpA4FVRJXJ2aaDAtF5+dXU+8d0cllSPuEsINnrPnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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