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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2262663946c52a525b2339dde0b625f8f06b8c5495aac4cc7acd23806afb0421' 
  AND token = 'jqgCFUsLScsLFIbknHNOYPpaVjowWv1K2ZvI8N/eawA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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