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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c990806d4c56f442c37b8c3cb9fe2f970d9ad6eb7b588c05936bc3e09e1cc24' 
  AND token = 'fpKDIbyvbtWzKXzRX4K8qnS/8lb2w07DXOTTwwY8J68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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