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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87e5e997f560bf95b00e4675e2fc4160dfbd9f320899a332dce790844d0665fc' 
  AND token = '/JsvxahkkByTrNiLHh2hTf4nUBw0rt2mf0yEHAqTrWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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