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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81c2fe69ab8bf5d2aaeae0a2b689c3e0df712c590ab8a8c8620665c4071fb1fa' 
  AND token = 'SruWpWXS1Y4CzVBQI1HLhU9gNuX1DSdEKxXkpPbkAPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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