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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f0f2111e30f09095666d4da08ab2b96945a27a44e5dfd5e9512edfee674e7c' 
  AND token = '1OWDv3TFuqa/ly+uuamrqlqDs7cFfx0QC4RUpKwSous=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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