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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '401542d2677256c121cf550c1b85f8e4e8e8e0eae622a47f104b57e37812312e' 
  AND token = 'wekBNU065/HCrhIQwFwJFgxkIRgZn6pcd4oez4lVS+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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