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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb91ee0fcfeda91d65f80110a3da2c12b31e0170724a3073c4e0970ccdc7e466' 
  AND token = '9cvws4wAQJe/PrGXhSZZ1bTifGlx7H6ERY9a1qGJa7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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