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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0851736118487da8d35a6d40738fffdc39d0e26ee6c35f74e570bed2b23ea76c' 
  AND token = 'psKe5ose+IM+RYN3KNMD7TtDfDB/wlTqvezym8ZQLqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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