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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee73698c0a83d9c87b9e9d2d0b9776768be3f1c4698a0287e48802e323f04caa' 
  AND token = 'Ju0MiVzfCLCdg6asTQk30pWZ7bvltwa7CKSLZLkkCmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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