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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8db4301cd76e8f5c0e5a213dc7d63f7d5f64cad6e85e063baeea3f96572a7e02' 
  AND token = 'NewAgN50DOOaF/vxUtzET1ZbO6AycokZjiJbY4q1gp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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