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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ff4b8ae4289c762ffc6c765131b857e48f533a225aadb326e0b2c621d5c0de1' 
  AND token = 'nWBH8XnliyfoiKHCQ7ziXosXyMK/DpU362zLtvARPiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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