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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86d5f4a6b8097989bd506db687cd36fe28cec25000fa8cf48b670b1543bf0f13' 
  AND token = '2J3LhBq1WDHj+D0kiaYSWcK3nLDreQvrWunGjb5wNdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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