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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '967b8f346b5d5de5d68a4c9a8ce4c1b7267db4b4a4b5c98d024ded8ba8d62beb' 
  AND token = 'bq8pVLvoPLOYYz/opdUEd79V9XaAoJUWtEim5aeUMco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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