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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83fd3e8a012b5d04e5e84420ff673131fc64faf84799e96cfa2ef2915e3d7047' 
  AND token = 'El8rSKUhcqmZ+x9YnKXqZT8rjmR9TsFOt4trZifWPlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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