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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '383858a4b0a7583a3c08068e9946d4658717c9f8eaf132f0f0f6a91d19b79339' 
  AND token = 'Fgxut4yL7GJ1D3mArmEeQP3gxxc84ISEh87KgF4K7yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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