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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61bccadcdcc8081d266e0cc773db0361575992c2ec6ee0dadaf4164c080d9810' 
  AND token = '2SQVVkRrZvYfbVTBIcNch5rfa8ugi1trV9xZe+lY9FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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