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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e06fd56407d442a254400d480726d7b6bda1965c9d60d5ae55bc25379caeda8' 
  AND token = 'nuhKHLzQ9O1j8IBWuVs8wroAMA/AbYlAFQorWu4hxq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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