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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c8e7f009bb8a02ca868fed327d5dc1a583bdafd2e2e8c8b4d984fb2fcd5f07b' 
  AND token = '1tdyeOv4BphjCub7wQyJMSD82YEjnKtk+x9cuJfhkAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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