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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afb94f2ca99a51de637d3a6a9caf705080d442aeecea64ac3e57b1a5eb03903f' 
  AND token = 'OD3MieB5tD5IlHHMBBFZW4Ur4IlMLyzuguAJI9N3o9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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