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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '499dc75bdec11b9cf466e65733584ae2b0da7c4092522cb30c0f3e885a599b77' 
  AND token = 'DnfkcC7D217QBE7eEV9V8MhEuLSzd6F/LQSX5f6R2Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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