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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2af07de5a4bd68dbfef9e7962b773003f9a3a01a2122c199d807fa5a804b1cfc' 
  AND token = 'kHiZ3gaN9439PdK7BukTvE5ikw5VzCT2vJP67aHMlAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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