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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f2af0ebf551a6b5c001ec7bb35a7b4dc2a0cc93610fbdf69600995e9b9ec06' 
  AND token = 'IpH0uDTyIN7YYdO0+YiT9bmbkSq/vVOe3bJ6Y9PZ0EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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