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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d19617d99b517bc1a6bd762c658656b6e37cc2dbb0626da613e698fd839a42d' 
  AND token = 'hx+P0gA9a3JJFdNfN4L5kUZvI1Hnhf+nH87aow3n2bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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