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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29cc3f2642e61e6a9d0fea3b986f286b907399f56bea0a8fc01966ec9874b86b' 
  AND token = 'WdBf6Xx4lVOnPIbWpxJJa5zM+DkZyGnIvXe0m3a9H9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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